STRUCTURE

Structure is to a set of parts to form a system. Also it is something that has a definite size and shape. This can be doing by humans or the environment.
There are different structure, “Permanent” such as buildings, damns and bridges. Also there is a “Temporary structure”, it used in ephemeral situations.

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you can visit this page http://www.next.cc/structure_b1.htm or http://calicia.wikispaces.com/Slides+of+Spatial+Organization